Approximate age: 4. One morning, after climbing out of my cradle, I walked down the hallway and noticed something outside our second story window. As I managed to stumble over to it, the thing outside (what was actually a hot air balloon) still seemed further and further away despite pressing my hands against the glass--which frustrated me. It was perhaps at that moment I realized how big the outside world was, also seeing my backyard from a higher persepctive than usual, and it terrified me. I thought I was stuck in a completely new place, so I started crying due to feeling lost.
As far as being 'continuous' goes, I still easily frustrate myself whenever I can't do something. Also, climbing out of cradles and climbing mountain cliffs are equally as difficult considering age.